[Week05] BOJ 1781: 컵라면

weekly/week05/BOJ_1781_컵라면/sukangpunch.java

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+package study.week05;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.PriorityQueue;
+
+// 컵라면
+public class BOJ_1781 {
+
+    static class Problem implements Comparable<Problem> {
+
+        int deadLine;
+        int cup;
+
+        public Problem(int deadLine, int cup) {
+            this.deadLine = deadLine;
+            this.cup = cup;
+        }
+
+        @Override
+        public int compareTo(Problem o) {
+            if (this.deadLine == o.deadLine) {
+                return o.cup - this.cup;
+            }
+            return this.deadLine - o.deadLine;
+        }
+    }
+
+    static PriorityQueue<Problem> pq;
+    static int N;
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        N = Integer.parseInt(br.readLine());
+        pq = new PriorityQueue<>();
+
+        for (int i = 0; i < N; i++) {
+            String[] s = br.readLine().split(" ");
+            int deadLine = Integer.parseInt(s[0]);
+            int cup = Integer.parseInt(s[1]);
+            pq.add(new Problem(deadLine, cup));
+        }
+
+        PriorityQueue<Integer> select = new PriorityQueue<>();
+
+        while(!pq.isEmpty()){
+            Problem problem = pq.poll();
+            int deadLine = problem.deadLine;
+            int cup = problem.cup;
+
+            if(select.size() < deadLine){
+                select.offer(cup);
+            }else{
+                if(!select.isEmpty() && select.peek() < cup){ // 만약 선택한 문제 중 가장 적은 컵라면보다 현재 추가하려는 problem 의 컵라면 개수가 더 많다면
+                    select.poll();
+                    select.offer(cup);
+                }
+            }
+        }
+
+        long result = 0;
+        for(int cup : select){
+            result += cup;
+        }
+
+        System.out.println(result);
+    }
+}